<?php
/**
* thumbnail.inc.php
*
* @author 		Ian Selby (ian@gen-x-design.com)
* @copyright 	Copyright 2006
* @license GNU/GPL
*/


/**
* PHP class for dynamically resizing, cropping, and rotating images for thumbnail purposes and either displaying them on-the-fly or saving them.
*
*/
if(!class_exists('JUThumbnail')){
class JUThumbnail {
/**
* Error message to display, if any
*
* @var string
*/
var $errmsg;
/**
* Whether or not there is an error
*
* @var boolean
*/
var $error;
/**
* Format of the image file
*
* @var string
*/
var $format;
/**
* File name and path of the image file
*
* @var string
*/
var $fileName;
/**
* Image meta data if any is available (jpeg/tiff) via the exif library
*
* @var array
*/
var $imageMeta;
/**
* Current dimensions of working image
*
* @var array
*/
var $currentDimensions;
/**
* New dimensions of working image
*
* @var array
*/
var $newDimensions;
/**
* Image resource for newly manipulated image
*
* @var resource
* @access private
*/
var $newImage;
/**
* Image resource for image before previous manipulation
*
* @var resource
* @access private
*/
var $oldImage;
/**
* Image resource for image being currently manipulated
*
* @var resource
* @access private
*/
var $workingImage;
/**
* Percentage to resize image by
*
* @var int
* @access private
*/
var $percent;
/**
* Maximum width of image during resize
*
* @var int
* @access private
*/
var $maxWidth;
/**
* Maximum height of image during resize
*
* @var int
* @access private
*/
var $maxHeight;

/**
* Class constructor
*
* @param string $fileName
* @return Thumbnail
*/
function JUThumbnail($fileName) {
//make sure the GD library is installed
if(!function_exists("gd_info")) {
echo 'You do not have the GD Library installed.  This class requires the GD library to function properly.' . "\n";
echo 'visit http://us2.php.net/manual/en/ref.image.php for more information';
exit;
}
//initialize variables
$this->errmsg               = '';
$this->error                = false;
$this->currentDimensions    = array();
$this->newDimensions        = array();
$this->fileName             = $fileName;
$this->imageMeta			= array();
$this->percent              = 100;
$this->maxWidth             = 0;
$this->maxHeight            = 0;

//check to see if file exists
if(!file_exists($this->fileName)) {
$this->errmsg = 'File not found';
$this->error = true;
}
//check to see if file is readable
elseif(!is_readable($this->fileName)) {
$this->errmsg = 'File is not readable';
$this->error = true;
}

//if there are no errors, determine the file format
if($this->error == false) {
//check if gif
if(stristr(strtolower($this->fileName),'.gif')) $this->format = 'GIF';
//check if jpg
elseif(stristr(strtolower($this->fileName),'.jpg') || stristr(strtolower($this->fileName),'.jpeg')) $this->format = 'JPG';
//check if png
elseif(stristr(strtolower($this->fileName),'.png')) $this->format = 'PNG';
//unknown file format
else {
$this->errmsg = 'Unknown file format';
$this->error = true;
}
}

//initialize resources if no errors
if($this->error == false) {
switch($this->format) {
case 'GIF':
$this->oldImage = ImageCreateFromGif($this->fileName);
break;
case 'JPG':
$this->oldImage = ImageCreateFromJpeg($this->fileName);
break;
case 'PNG':
$this->oldImage = ImageCreateFromPng($this->fileName);
break;
}

$size = GetImageSize($this->fileName);
$this->currentDimensions = array('width'=>$size[0],'height'=>$size[1]);
$this->newImage = $this->oldImage;
//$this->gatherImageMeta();
}

// if($this->error == true) {
//           return false;
//       }
}

/**
* Must be called to free up allocated memory after all manipulations are done
*
*/
function destruct() {
if(is_resource($this->newImage)) @ImageDestroy($this->newImage);
if(is_resource($this->oldImage)) @ImageDestroy($this->oldImage);
if(is_resource($this->workingImage)) @ImageDestroy($this->workingImage);
}

/**
* Returns the current width of the image
*
* @return int
*/
function getCurrentWidth() {
return $this->currentDimensions['width'];
}

/**
* Returns the current height of the image
*
* @return int
*/
function getCurrentHeight() {
return $this->currentDimensions['height'];
}

/**
* Calculates new image width
*
* @param int $width
* @param int $height
* @return array
*/
function calcWidth($width,$height) {
$newWp = (100 * $this->maxWidth) / $width;
$newHeight = ($height * $newWp) / 100;
return array('newWidth'=>intval($this->maxWidth),'newHeight'=>intval($newHeight));
}

/**
* Calculates new image height
*
* @param int $width
* @param int $height
* @return array
*/
function calcHeight($width,$height) {
$newHp = (100 * $this->maxHeight) / $height;
$newWidth = ($width * $newHp) / 100;
return array('newWidth'=>intval($newWidth),'newHeight'=>intval($this->maxHeight));
}

/**
* Calculates new image size based on percentage
*
* @param int $width
* @param int $height
* @return array
*/
function calcPercent($width,$height) {
$newWidth = ($width * $this->percent) / 100;
$newHeight = ($height * $this->percent) / 100;
return array('newWidth'=>intval($newWidth),'newHeight'=>intval($newHeight));
}

/**
* Calculates new image size based on width and height, while constraining to maxWidth and maxHeight
*
* @param int $width
* @param int $height
*/
function calcImageSize($width,$height) {
$newSize = array('newWidth'=>$width,'newHeight'=>$height);

if($this->maxWidth > 0) {

$newSize = $this->calcWidth($width,$height);

if($this->maxHeight > 0 && $newSize['newHeight'] > $this->maxHeight) {
$newSize = $this->calcHeight($newSize['newWidth'],$newSize['newHeight']);
}

//$this->newDimensions = $newSize;
}

if($this->maxHeight > 0) {
$newSize = $this->calcHeight($width,$height);

if($this->maxWidth > 0 && $newSize['newWidth'] > $this->maxWidth) {
$newSize = $this->calcWidth($newSize['newWidth'],$newSize['newHeight']);
}

//$this->newDimensions = $newSize;
}

$this->newDimensions = $newSize;
}

/**
* Calculates new image size based percentage
*
* @param int $width
* @param int $height
*/
function calcImageSizePercent($width,$height) {
if($this->percent > 0) {
$this->newDimensions = $this->calcPercent($width,$height);
}
}

/**
* Displays error image
*
*/
function showErrorImage() {
header('Content-type: image/png');
$errImg = ImageCreate(220,25);
$bgColor = imagecolorallocate($errImg,0,0,0);
$fgColor1 = imagecolorallocate($errImg,255,255,255);
$fgColor2 = imagecolorallocate($errImg,255,0,0);
imagestring($errImg,3,6,6,'Error:',$fgColor2);
imagestring($errImg,3,55,6,$this->errmsg,$fgColor1);
imagepng($errImg);
imagedestroy($errImg);
}

/**
* Resizes image to maxWidth x maxHeight
*
* @param int $maxWidth
* @param int $maxHeight
*/
function resize($maxWidth = 0, $maxHeight = 0) {
$this->maxWidth = $maxWidth;
$this->maxHeight = $maxHeight;
$this->calcImageSize($this->currentDimensions['width'],$this->currentDimensions['height']);

if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($this->newDimensions['newWidth'],$this->newDimensions['newHeight']);
}
else {
$this->workingImage = ImageCreate($this->newDimensions['newWidth'],$this->newDimensions['newHeight']);
}

ImageCopyResampled(
$this->workingImage,
$this->oldImage,
0,
0,
0,
0,
$this->newDimensions['newWidth'],
$this->newDimensions['newHeight'],
$this->currentDimensions['width'],
$this->currentDimensions['height']
);

$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $this->newDimensions['newWidth'];
$this->currentDimensions['height'] = $this->newDimensions['newHeight'];
}
/*
* Function resize and crop image
* @Modified joomvision
* @param int width | int height
*/
function resize_image($width,$height,$crop=true,$aspect=true){
$size = getimagesize( $this->fileName);
// if it's not a image.
if( !$size ){ return ''; }
// case 1: render image base on the ratio of source.
$x_ratio = $width / $size[0];
$y_ratio = $height / $size[1];
// set dst, src
$dst = new stdClass();
$src = new stdClass();
$src->y = $src->x = 0;
$dst->y = $dst->x = 0;
if ($width > $size[0])
$width = $size[0];
if ($height > $height)
$height = $size[1];
if ( $crop ) {	// processing crop image
$dst->w = $width;
$dst->h = $height;
if ( ($size[0] <= $width) && ($size[1] <= $height) ) {
$src->w = $width;
$src->h = $height;
} else {
if ($x_ratio < $y_ratio) {
$src->w = ceil ( $width / $y_ratio );
$src->h = $size[1];
} else {
$src->w = $size[0];
$src->h = ceil ( $height / $x_ratio );
}
}
$src->x = floor ( ($size[0] - $src->w) / 2 );
$src->y = floor ( ($size[1] - $src->h) / 2 );
} else { // processing resize image.
$src->w = $size[0];
$src->h = $size[1];
if( $aspect ) { // using ratio
if ( ($size[0] <= $width) && ($size[1] <= $height) ) {
$dst->w = $size[0];
$dst->h = $size[1];
} else if ( ($size[0] <= $width) && ($size[1] <= $height) ) {
$dst->w = $size[0];
$dst->h = $size[1];
} else if ( ($x_ratio * $size[1]) < $height ) {
$dst->h = ceil ( $x_ratio * $size[1] );
$dst->w = $width;
} else {
$dst->w = ceil ( $y_ratio * $size[0] );
$dst->h = $height;
}
} else { // resize image without the ratio of source.
$dst->w = $width;
$dst->h = $height;
}
}
if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($dst->w,$dst->h);
}
else {
$this->workingImage = ImageCreate($dst->w,$dst->h);
}
if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($dst->w,$dst->h);
}
else {
$this->workingImage = ImageCreate($dst->w,$dst->h);
}
ImageCopyResampled(
$this->workingImage,
$this->oldImage,
$dst->x,
$dst->y,
$src->x,
$src->y,
$dst->w,
$dst->h,
$src->w,
$src->h
);
$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $dst->w;
$this->currentDimensions['height'] = $dst->h;
}
//End resize image

/**
* Resizes the image by $percent percent
*
* @param int $percent
*/
function resizePercent($percent = 0) {
$this->percent = $percent;

$this->calcImageSizePercent($this->currentDimensions['width'],$this->currentDimensions['height']);

if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($this->newDimensions['newWidth'],$this->newDimensions['newHeight']);
}
else {
$this->workingImage = ImageCreate($this->newDimensions['newWidth'],$this->newDimensions['newHeight']);
}

ImageCopyResampled(
$this->workingImage,
$this->oldImage,
0,
0,
0,
0,
$this->newDimensions['newWidth'],
$this->newDimensions['newHeight'],
$this->currentDimensions['width'],
$this->currentDimensions['height']
);

$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $this->newDimensions['newWidth'];
$this->currentDimensions['height'] = $this->newDimensions['newHeight'];
}

/**
* Crops the image from calculated center in a square of $cropSize pixels
*
* @param int $cropSize
*/
function cropFromCenter($cropSize) {
if($cropSize > $this->currentDimensions['width']) $cropSize = $this->currentDimensions['width'];
if($cropSize > $this->currentDimensions['height']) $cropSize = $this->currentDimensions['height'];

$cropX = intval(($this->currentDimensions['width'] - $cropSize) / 2);
$cropY = intval(($this->currentDimensions['height'] - $cropSize) / 2);

if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($cropSize,$cropSize);
}
else {
$this->workingImage = ImageCreate($cropSize,$cropSize);
}

imagecopyresampled(
$this->workingImage,
$this->oldImage,
0,
0,
$cropX,
$cropY,
$cropSize,
$cropSize,
$cropSize,
$cropSize
);

$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $cropSize;
$this->currentDimensions['height'] = $cropSize;
}

/**
* Advanced cropping function that crops an image using $startX and $startY as the upper-left hand corner.
*
* @param int $startX
* @param int $startY
* @param int $width
* @param int $height
*/
function crop($startX,$startY,$width,$height) {
//make sure the cropped area is not greater than the size of the image
if($width > $this->currentDimensions['width']) $width = $this->currentDimensions['width'];
if($height > $this->currentDimensions['height']) $height = $this->currentDimensions['height'];
//make sure not starting outside the image
if(($startX + $width) > $this->currentDimensions['width']) $startX = ($this->currentDimensions['width'] - $width);
if(($startY + $height) > $this->currentDimensions['height']) $startY = ($this->currentDimensions['height'] - $height);
if($startX < 0) $startX = 0;
if($startY < 0) $startY = 0;

if(function_exists("ImageCreateTrueColor")) {
$this->workingImage = ImageCreateTrueColor($width,$height);
}
else {
$this->workingImage = ImageCreate($width,$height);
}

imagecopyresampled(
$this->workingImage,
$this->oldImage,
0,
0,
$startX,
$startY,
$width,
$height,
$width,
$height
);

$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $width;
$this->currentDimensions['height'] = $height;
}

/**
* Outputs the image to the screen, or saves to $name if supplied.  Quality of JPEG images can be controlled with the $quality variable
*
* @param int $quality
* @param string $name
*/
function show($quality=100,$name = '') {
switch($this->format) {
case 'GIF':
if($name != '') {
ImageGif($this->newImage,$name);
}
else {
header('Content-type: image/gif');
ImageGif($this->newImage);
}
break;
case 'JPG':
if($name != '') {
ImageJpeg($this->newImage,$name,$quality);
}
else {
header('Content-type: image/jpeg');
ImageJpeg($this->newImage,'',$quality);
}
break;
case 'PNG':
if($name != '') {
ImagePng($this->newImage,$name);
}
else {
header('Content-type: image/png');
ImagePng($this->newImage);
}
break;
}
}

/**
* Saves image as $name (can include file path), with quality of # percent if file is a jpeg
*
* @param string $name
* @param int $quality
*/
function save($name,$quality=100) {
$this->show($quality,$name);
}

/**
* Creates Apple-style reflection under image, optionally adding a border to main image
*
* @param int $percent
* @param int $reflection
* @param int $white
* @param bool $border
* @param string $borderColor
*/
function createReflection($percent,$reflection,$white,$border = true,$borderColor = '#a4a4a4') {
$width = $this->currentDimensions['width'];
$height = $this->currentDimensions['height'];

$reflectionHeight = intval($height * ($reflection / 100));
$newHeight = $height + $reflectionHeight;
$reflectedPart = $height * ($percent / 100);

$this->workingImage = ImageCreateTrueColor($width,$newHeight);

ImageAlphaBlending($this->workingImage,true);

$colorToPaint = ImageColorAllocateAlpha($this->workingImage,255,255,255,0);
ImageFilledRectangle($this->workingImage,0,0,$width,$newHeight,$colorToPaint);

imagecopyresampled(
$this->workingImage,
$this->newImage,
0,
0,
0,
$reflectedPart,
$width,
$reflectionHeight,
$width,
($height - $reflectedPart));
$this->imageFlipVertical();

imagecopy($this->workingImage,$this->newImage,0,0,0,0,$width,$height);

imagealphablending($this->workingImage,true);

for($i=0;$i<$reflectionHeight;$i++) {
$colorToPaint = imagecolorallocatealpha($this->workingImage,255,255,255,($i/$reflectionHeight*-1+1)*$white);
imagefilledrectangle($this->workingImage,0,$height+$i,$width,$height+$i,$colorToPaint);
}

if($border == true) {
$rgb = $this->hex2rgb($borderColor,false);
$colorToPaint = imagecolorallocate($this->workingImage,$rgb[0],$rgb[1],$rgb[2]);
imageline($this->workingImage,0,0,$width,0,$colorToPaint); //top line
imageline($this->workingImage,0,$height,$width,$height,$colorToPaint); //bottom line
imageline($this->workingImage,0,0,0,$height,$colorToPaint); //left line
imageline($this->workingImage,$width-1,0,$width-1,$height,$colorToPaint); //right line
}

$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $width;
$this->currentDimensions['height'] = $newHeight;
}

/**
* Inverts working image, used by reflection function
*
* @access	private
*/
function imageFlipVertical() {
$x_i = imagesx($this->workingImage);
$y_i = imagesy($this->workingImage);

for($x = 0; $x < $x_i; $x++) {
for($y = 0; $y < $y_i; $y++) {
imagecopy($this->workingImage,$this->workingImage,$x,$y_i - $y - 1, $x, $y, 1, 1);
}
}
}

/**
* Converts hexidecimal color value to rgb values and returns as array/string
*
* @param string $hex
* @param bool $asString
* @return array|string
*/
function hex2rgb($hex, $asString = false) {
// strip off any leading #
if (0 === strpos($hex, '#')) {
$hex = substr($hex, 1);
} else if (0 === strpos($hex, '&H')) {
$hex = substr($hex, 2);
}

// break into hex 3-tuple
$cutpoint = ceil(strlen($hex) / 2)-1;
$rgb = explode(':', wordwrap($hex, $cutpoint, ':', $cutpoint), 3);

// convert each tuple to decimal
$rgb[0] = (isset($rgb[0]) ? hexdec($rgb[0]) : 0);
$rgb[1] = (isset($rgb[1]) ? hexdec($rgb[1]) : 0);
$rgb[2] = (isset($rgb[2]) ? hexdec($rgb[2]) : 0);

return ($asString ? "{$rgb[0]} {$rgb[1]} {$rgb[2]}" : $rgb);
}

/**
* Reads selected exif meta data from jpg images and populates $this->imageMeta with appropriate values if found
*
*/
function gatherImageMeta() {
//only attempt to retrieve info if exif exists
if(function_exists("exif_read_data") && $this->format == 'JPG') {
$imageData = exif_read_data($this->fileName);
if(isset($imageData['Make']))
$this->imageMeta['make'] = ucwords(strtolower($imageData['Make']));
if(isset($imageData['Model']))
$this->imageMeta['model'] = $imageData['Model'];
if(isset($imageData['COMPUTED']['ApertureFNumber'])) {
$this->imageMeta['aperture'] = $imageData['COMPUTED']['ApertureFNumber'];
$this->imageMeta['aperture'] = str_replace('/','',$this->imageMeta['aperture']);
}
if(isset($imageData['ExposureTime'])) {
$exposure = explode('/',$imageData['ExposureTime']);
$exposure = round($exposure[1]/$exposure[0],-1);
$this->imageMeta['exposure'] = '1/' . $exposure . ' second';
}
if(isset($imageData['Flash'])) {
if($imageData['Flash'] > 0) {
$this->imageMeta['flash'] = 'Yes';
}
else {
$this->imageMeta['flash'] = 'No';
}
}
if(isset($imageData['FocalLength'])) {
$focus = explode('/',$imageData['FocalLength']);
$this->imageMeta['focalLength'] = round($focus[0]/$focus[1],2) . ' mm';
}
if(isset($imageData['DateTime'])) {
$date = $imageData['DateTime'];
$date = explode(' ',$date);
$date = str_replace(':','-',$date[0]) . ' ' . $date[1];
$this->imageMeta['dateTaken'] = date('m/d/Y g:i A',strtotime($date));
}
}
}

/**
* Rotates image either 90 degrees clockwise or counter-clockwise
*
* @param string $direction
*/
function rotateImage($direction = 'CW') {
if($direction == 'CW') {
$this->workingImage = imagerotate($this->workingImage,-90,0);
}
else {
$this->workingImage = imagerotate($this->workingImage,90,0);
}
$newWidth = $this->currentDimensions['height'];
$newHeight = $this->currentDimensions['width'];
$this->oldImage = $this->workingImage;
$this->newImage = $this->workingImage;
$this->currentDimensions['width'] = $newWidth;
$this->currentDimensions['height'] = $newHeight;
}
}
}
?>